//定义划分的份数为@num份
@num:20;
//定义PC端的html字体大小
html{
  font-size: 64px;
}
@media screen and (min-width:400px){
  html{
    font-size:(400px/@num);
  }
}
@media screen and (min-width:480px){
  html{
    font-size:(480px/@num);
  }
}
@media screen and (min-width:560px){
  html{
    font-size:(560px/@num);
  }
}
@media screen and (min-width:640px){
  html{
    font-size:(640px/@num);
  }
}
@media screen and (min-width:720px){
  html{
    font-size:(720px/@num);
  }
}
@media screen and (min-width:800px){
  html{
    font-size:(800px/@num);
  }
}
@media screen and (min-width:880px){
  html{
    font-size:(880px/@num);
  }
}
@media screen and (min-width:960px){
  html{
    font-size:(960px/@num);
  }
}
@media screen and (min-width:1040px){
  html{
    font-size:(1040px/@num);
  }
}
@media screen and (min-width:1120px){
  html{
    font-size:(1120px/@num);
  }
}
@media screen and (min-width:1200px){
  html{
    font-size:(1200px/@num);
  }
}
@media screen and (min-width:1280px){
  html{
    font-size:(1280px/@num);
  }
}
